Do Hawaiis Interstate route numbers have a hyphen between the “H” and the number?
Officially, the Interstate route numbers are hyphenated (H-1, H-2, etc.). The hyphen is almost always omitted from the route shields on the freeways themselves, permitting a sleek design with large numbers. However, some of the newer signs on local streets, directing traffic onto Interstate entrances, and also a half-dozen signs erected since 2002 showing the new names adopted that year for several Hawaii Interstates, include the hyphen in the route number (as well as the state name, which is omitted from standard on-freeway route shields — as if anybody ever needed a reminder that they were still in Hawaii!). See the Introduction page to the Hawaii Highways road photos collection for examples. The hyphenated Interstate route numbers are rather awkward in some ways — for example, something like “Interstates H-1-H-3” is a more confusing reference to consecutive routes than “Interstates H1-H3” — and the “H1, “H2” and “H3” shields look nicer and are much easier to read from a distance
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